Rewrite Error.prototype.toString in C++.

src/heap/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 306 matching lines @@
   V(home_object_symbol)             \
   V(intl_initialized_marker_symbol) \
   V(intl_impl_object_symbol)        \
   V(promise_debug_marker_symbol)    \
   V(promise_has_handler_symbol)     \
   V(class_script_symbol)            \
   V(class_start_position_symbol)    \
   V(class_end_position_symbol)      \
   V(error_start_pos_symbol)         \
   V(error_end_pos_symbol)           \
-  V(error_script_symbol)
+  V(error_script_symbol)            \
+  V(internal_error_symbol)
 
 #define PUBLIC_SYMBOL_LIST(V)                                    \
   V(has_instance_symbol, symbolHasInstance, Symbol.hasInstance)  \
   V(is_concat_spreadable_symbol, symbolIsConcatSpreadable,       \
     Symbol.isConcatSpreadable)                                   \
   V(is_regexp_symbol, symbolIsRegExp, Symbol.isRegExp)           \
   V(iterator_symbol, symbolIterator, Symbol.iterator)            \
   V(to_string_tag_symbol, symbolToStringTag, Symbol.toStringTag) \
   V(unscopables_symbol, symbolUnscopables, Symbol.unscopables)
 
@@ skipping 2442 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_